叶片弯曲对跨音速涡轮叶栅流场的影响  

The Effect of Turbine Blade Positive Curving on the Flow Field of a Turbine Transonic Cascade

作　　者：王松涛[1] 吴猛[1] 冯国泰[1] 王仲奇[1] 

机构地区：[1]哈尔滨工业大学热力发动机教研室,黑龙江哈尔滨150001

出　　处：《热能动力工程》2000年第3期239-242,共4页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助! ( 5 963 6180 );教育部博士点基金资助! ( 970 2 13 0 5 )

摘　　要：对均匀加载叶型所构成的直叶栅及不同弯角所构成的弯叶栅流场进行了数值模拟。研究了弯叶片作用下型面压力分布、马赫数等值线及叶片表面压力分布的改变 ,同时考察了叶片弯曲对马蹄涡及通道涡生成位置的影响。叶片正弯后有助于减少端壁处的横向压力梯度 ,削弱端壁二次流动 ;另外叶片正弯后会使马蹄涡起始分离点位置向流道中间偏移 ,促使通道涡提早发生。本文所选用的差分格式为具有TVD性质的三阶精度的Godunov格式 ,湍流模型为修正后的BA numerical simulation was conducted on the flow field of a straight cascade com posed of uniformly loaded blades and a bowed cascade composed of blades of diffe rent curved angles. A study was performed of the change under the curved blade a ction of the blade profile pressure distribution, Mach number contour lines and blade surface pressure distribution. Meanwhile, an investigation was conducted o f the effect of blade curving on the location of horseshoe vortex and passage vo rtex formation. A positive curving of the blades has been found to be conducive to a decrease in the transverse pressure gradient at the end wall and a weakenin g of the end wall secondary flows. Moreover, the blade positive curving will le ad to a shift of the initial separation point of the horseshoe vortex to the mid dle of the flow passage, bringing about a generation of the passage vortex ahead of the anticipated time. The differential scheme selected in this paper is a Go dunov one of the third order precision with TVD properties. The turbulent flow model is a B L algebraic one after a correction.

关 键 词：正弯叶片 流场 数值模拟 跨音速 涡轮 叶栅 

分 类 号：TB126[理学—工程力学]